You mean that when you used to use them (before they went into storage) they only charged to 3000mAh , and now you have taken them out of storage they are charging to 4200mAh?
If this is the case then it is normal for the first couple of cycles. The electrolyte will have settled within the cell and needs to be redistributed though cycling. The cells may well be getting hotter due to the increased resistance as Dan said. I would be surprised if the discharge capacity is very high though if you were previously only getting 3000mAh.
Neil
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